Binding to ObservableCollection for Visibility. What is wrong with this XAML or ?

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My converter is called once when the application starts up and then not again. The converter is doing its job. I just need it called when items are added to the ObservableCollection :
this.BrightnessValueList.Add(new KeyValuePair<string, double>(focuserMotorStepPosition.ToString("00000"), starMaxBrightness));

If more information is needed, just let me know. I thought the PropertyChanged was supposed to be raised with the converter being called when the "Count" property of the ObservableCollection changes (i.e. when adding an item in my case).

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